#include <stdlib.h>
#include <stdio.h>

void add(int,char);
void print();

struct x
{
        int i;
        char c;
        struct x * next;
};

struct x * head = NULL;

int main(void)
{
        add(1,'a');
        add(2,'b');
        add(3,'c');
        add(4,'d');
        print();
        return 0;
}

void add(int i, char c)
{
        struct x * current = head;

        if( head == NULL )
        {
                head = malloc(  sizeof( struct x)  );
                head->i = i;
                head->c = c;
                head->next = NULL;
        }
        else
        {
                for(;current->next != NULL; current=current->next);
                current->next=malloc(sizeof(struct x));
                current = current->next;
                current->i = i;
                current->c = c;
                current->next = NULL;
        }
}

void print()
{
        struct x * current = head;
        if( current == NULL ) return;
        for(;current != NULL; current=current->next )
        {
                printf("%d %c\n", current->i, current->c);
        }
}